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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969327449e98a6ce8f109e49ff7a301d419291431099ed005ad3432600d89c37' 
  AND token = 'w3H8pzCnEnweMLNWqkeHKntvR3hVc7Wvscj4dCIKPKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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