SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd6b921a4e3f8d3d9b7463d986a124e98a4ea35f8afbeb9de2db4265b4028d28' 
  AND token = 'VhR7wI9pljltU10hnSp+7F/x2n+RVjBVFfH5twq/+IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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