SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0711902ff57f503f0eb4f8fc814c292276351eab84af1857192d0f5caf464d9b' 
  AND token = '8di4rBgJohR2iSVl9nEWs4q7+QaLcMlVpwU3LvvPAUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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