SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6f1ff54c215ba5b2f38b13775d6e2994e67b14ddb08207e094d56ed9e0cc6f' 
  AND token = 'gEJbKRyaWOqpa5VQxlOKcvGz6qYCbUBlSUOcIu8d/iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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