SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19379a3d0cccd860dbb62782f8e78d6ff963b67e96e59ff887ca442cefb55625' 
  AND token = 'GyNzxGDPmUCQl0ZvkcJwFWAjM/UbfdmVjL3AOYDzCjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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