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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feba39609b0115d5f96692011e9617d99a3c8bd2ae47065654cb6110105b9877' 
  AND token = 'H6vcy0ZM8fJxkAy48Z2e7khyIBmfgzVA5rXO4p7Prlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}