ObjectQuery execution taking too long.   

The ObjectQuery is taking too long.
Following is the QueryPlan for the actual Query. Please suggest any improvements that can be made.

group input collection temp collection defined as

for q2 in (Users ObjectMap using UNIQUE INDEX key=( ?1) AND_Collection Users ObjectMap using INDEX on DELETED = (false))

for q3 in userroles ObjectMap using INDEX on USER_ID = ( q2.id)

for q4 in ( (roleaccounts ObjectMap using INDEX on ROLE_ID = ( q3.getRoleId()) AND_Collection roleaccounts ObjectMap using INDEX on ACCOUNT_ID = ( ?2))

AND_Collection roleaccounts ObjectMap using RANGE INDEX on ACCOUNT_PERMISSION_ID with range(,999))

filter ((((( q3.getUserId() = q2.id ) AND ( q4.getRoleId() = q3.getRoleId() ) ) AND ( q4.getAccountId() = ?2 ) ) AND ( q2.deleted = false ) ) AND (

q4.getAccountPermissionId() < 999 ) )

returning new Tuple( q4.getAccountPermissionId() )

group output collection s1 (MAX( q1.c[1]) )

for q1 in s[1]
returning new Tuple( q1.c[1]

Query String:

"select max(ra.accountPermissionId) " +
"from Users u, userroles ur, roleaccounts ra " +
"where u.id = ?1 " +
"and u.id = ur.userId " +
"and ur.roleId = ra.roleId " +
"and ra.accountId = ?2 " +
"and u.deleted = FALSE " +
"and ra.accountPermissionId < 999");