mysql - SQL: Select the next datetime in the future from one of two columns -

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i have table similar this:

+---------------------+---------------------+ |                |                  | +---------------------+---------------------+ | 2014-07-01 01:00:00 | null                | +---------------------+---------------------+ | 2015-08-01 02:00:00 | 2015-10-01 02:00:00 | +---------------------+---------------------+ | 2015-09-01 03:00:00 | 2015-10-01 03:00:00 | +---------------------+---------------------+

and need know next datetime in future, should be: 2015-08-01 02:00:00

i'm looking "correct" answer, ideally without subqueries or joins.

edit:

assuming from before to each row, don't need least:

select min(if(`from` > now(), `from`, `to`)) `yourtable` `from` > now()    or `to` > now();

this works because 1 of from or to have > now() or where eliminates row. in procedural pseudo code like

x = ("from" "from" > now) ,     ("to" "from" < , "to" > now) min(x)

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