Sorry, I answered too quickly:

The second one was wrong - this one ensures c and d are contained.

(defn foo [a b & {:keys [c d] :as m}] 
{:pre [(every? (partial contains? m) [:c :d]]}
1)

And the last one was un-idiomatic - this one checks whether only c and d 
are contained.

(defn foo [a b & {:keys [c d] :as m}] 
{:pre [(empty? (dissoc m :c :d))]}
1)


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