SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8ac38c63acd00f6835b26fe6c38b24bd6e0c02345eba206bde3d92699f3014' 
  AND token = 'Re1YrepxavnBp4JTJQO/IPWpoIYYMPRYH83JBFu8RxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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