Anyone have syntax to optimize speed of count, to check record existance?

Often just want to check for the existence of ANY records and don't need a 
full count, but I only know how to get info from full count.  See below 
where logic only cares if count is greater than zero.

    checking_for_already_existing_connection_count = 
db((db.VerifiedConnection.personID == personID.id) & 
(db.VerifiedConnection.connectedTo == auth.user_id)).count()
    if checking_for_already_existing_connection_count > 0:
        redirect(URL('error_duplicate_role')) 

Do you have phrasing that perhaps includes ".select(limitby=(0,1)).first()"?

thanks,

Alex Glaros

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