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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4e0fa1911cf5cf889f221b8b38f37da8fb9b7cc348d59ca87cb3e64bd330cc' 
  AND token = 'qAEC8MwYcYpIQLE5xTr+biFNifS7fEycgxHFAHqpcL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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