SELECT 
  data 
FROM 
  cscart_order_data 
WHERE 
  order_id = 453 
  AND type = 'T'

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_order_data",
          "access_type": "const",
          "possible_keys": ["idx_order_id_type"],
          "key": "idx_order_id_type",
          "key_length": "6",
          "used_key_parts": ["order_id", "type"],
          "ref": ["const", "const"],
          "rows": 1,
          "filtered": 100
        }
      }
    ]
  }
}