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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ee18d829b99dfb0e1689674c06cef0da7bda94d5baa2ffff37055b90400432' 
  AND token = 'moS9J7Mh2m6YEcL2d61GURvVDaUZH7GGso/ZYX9c/Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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