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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cab386cc89aecbc71f58bf54eef268f4cd864f049c859e7d360f68d9faad99' 
  AND token = 'AkUbF2NX04n6JFQJdOTQ0ANxaA/5DrO+WM7MIM+eC7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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