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The following lisp code demonstrates how the value of a variable var can be injected into the lambda used as START-FUNC in (async-start START-FUNC &optional FINISH-FUNC). I changed the lambda START-FUNC such that it returns a string modified with the value of the variable. Since the return value of START-FUNC is printed by FINISH-FUNC it is easier to check that the injection is successful.

(let ((var "value-of-variable"))
  (async-start
   ;; What to do in the child process
   `(lambda ()
      (sleep-for 3)
      ,(format "This is a %s" var))

       ;; What to do when it finishes
       (lambda (result)
         (message "Async process done, result should be 222: %s"
                  result))))