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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db4c547faaa19e3d9389c498b7de8ce5a9ec212dbfbdea4fa98456b44c097e9' 
  AND token = 'N9pAxNsVhBOi6tFW0lEQrPfMq/26lOJvvN3zTcrd7j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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