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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e83f03afef698067eca7a9430ef99986ebe899d366172008dd2121e3fac7435' 
  AND token = '17knD025qrwEwi65Iz8RsKQXfOo5mRsjGkTIsYcObh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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