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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ed9e6c5abaf20fbbb7c965403eef82346b8a09cf99b5d83246279f773af1f1' 
  AND token = 'Grj5yzEJKEfXW5mt2APqKcmk2/nCo7G9Wsgj49nyxlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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