Open = High and Open = Low is a widely used scanner across the day traders community. Here is the Amibroker exploration code which looks for stocks with matching open and high lows and matching open = low values. This scanner is built in such a way that it works even on lower timeframes (1min, 5min, 15min etc).
It is recommended to scan using watchlist rather scanning across the universe. And make sure that all the symbols have enough data available to perform the scan. Empty dataset could result in absurd behavior during the exploration process. And while running the exploration make sure the range is selected as 1 Recent Day as shown in the above image