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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9419c85edd5edac7472bb3e3105ec4b46853b7263889013dd78943ae51ab7972' 
  AND token = '9t99/PeHECzkFXq9FZ6SiLJw/RxARI9OkIxPh8HmC48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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