SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '133a68bd1bdd824aead4a6240f33f69d234050498609063b54db53dc36280921' 
  AND token = '02+ZsJaBbuqKgh/7kq+wU5TZDP2DOy5oLvhjrVobAW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}