SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63d411ae63623cbb10cdd8cd2a50cf7f3e8f5f72d3cc7af6fa29fe3b460cb17' 
  AND token = 'ZYp6J6eUMVK0MahGgkKm2JtM/XtP+lZkBDTp/JqAcNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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