SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716c117148a8dd966fd8fca05411286115be75c42ba0fe4e6ea2d63d32329a94' 
  AND token = 'Gft3oglj+vJteD9vMNRjR6tVB+azLwndLM0D5J9c6qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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