Nginx location exact match matches beyond arguement

In my nginx config, I would like to catch /foo-bar/ and do a rewrite using location, but for it to ignore /foo-bar/anything-else.

I've tried:

location = /foo-bar/ {

and

location ~ ^/foo-bar/$ {

and

location ~ /foo-bar/ { 

but it also catches and rewrites

/foo-bar/?t=aaa-bbb-ccc

How do I catch only

/foo-bar/ 

and not

/foo-bar/?t=aaa-bbb-ccc  

?

Thanks.

As per comment thread in cnst answer, I used:

if ($request_uri = "/foo-bar/") { rewrite ^ … permanent; }

and I never used

/location/

location = /foo/ {
    rewrite  ^  …  redirect;
}
location ~ /foo/ {
    return  404;
}

If this doesn't work, it must be the infamous permanent caching of the 301 Moved Permanently responses — try your request with curl -v to make sure it works or doesn't work, and/or clear the whole cache of your Gecko or other browser (in Gecko there is no other way around it (other than clearing the whole cache) — the Shift-refresh trick does not apply to 301).

Update: if you also need to ensure that no args are accepted (e.g. /foo/?test), then use the following:

location = /foo/ {
    if ($args) { return 403; }
    rewrite  ^  …  redirect;
}