SELECT 
  lang.name, 
  lang.value 
FROM 
  csscart_language_values lang 
WHERE 
  lang.lang_code = 'en' 
  AND lang.name IN (
    'text_out_of_stock', 'sku', 'select_options', 
    'old_price', 'old_price', 'list_price', 
    'list_price', 'enter_your_price', 
    'contact_us_for_price', 'sign_in_to_view_price', 
    'inc_tax', 'including_tax', 'you_save', 
    'you_save', 'save_discount', 'free_shipping', 
    'save_discount', 'save_discount', 
    'availability', 'items', 'on_backorder', 
    'in_stock', 'availability', 'in_stock', 
    'on_backorder', 'availability', 
    'quantity', 'text_cart_min_qty', 
    'text_edp_product', 'text_out_of_stock', 
    'sku', 'select_options', 'old_price', 
    'old_price', 'list_price', 'list_price', 
    'enter_your_price', 'contact_us_for_price', 
    'sign_in_to_view_price', 'inc_tax', 
    'including_tax', 'you_save', 'you_save', 
    'save_discount', 'free_shipping', 
    'save_discount', 'save_discount', 
    'availability', 'items', 'on_backorder', 
    'in_stock', 'availability', 'in_stock', 
    'on_backorder', 'availability', 
    'quantity', 'text_cart_min_qty', 
    'text_edp_product'
  )

Query time 0.00067

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "48.01"
    },
    "table": {
      "table_name": "lang",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "lang_code",
        "name"
      ],
      "key_length": "392",
      "rows_examined_per_scan": 20,
      "rows_produced_per_join": 20,
      "filtered": "100.00",
      "index_condition": "((`demoecarter_pos`.`lang`.`lang_code` = 'en') and (`demoecarter_pos`.`lang`.`name` in ('text_out_of_stock','sku','select_options','old_price','old_price','list_price','list_price','enter_your_price','contact_us_for_price','sign_in_to_view_price','inc_tax','including_tax','you_save','you_save','save_discount','free_shipping','save_discount','save_discount','availability','items','on_backorder','in_stock','availability','in_stock','on_backorder','availability','quantity','text_cart_min_qty','text_edp_product','text_out_of_stock','sku','select_options','old_price','old_price','list_price','list_price','enter_your_price','contact_us_for_price','sign_in_to_view_price','inc_tax','including_tax','you_save','you_save','save_discount','free_shipping','save_discount','save_discount','availability','items','on_backorder','in_stock','availability','in_stock','on_backorder','availability','quantity','text_cart_min_qty','text_edp_product')))",
      "cost_info": {
        "read_cost": "44.01",
        "eval_cost": "4.00",
        "prefix_cost": "48.01",
        "data_read_per_join": "7K"
      },
      "used_columns": [
        "lang_code",
        "name",
        "value"
      ]
    }
  }
}