SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf7cb97a7b034b389c276d288e1b44ff6e8eef8f48f63e22e0bcd8c858ab71c' 
  AND token = 'EngiGIRwHhCwiVT8Bk00/zpuOdQrmXqeThNj35pMmKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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