SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd1925c877c971721ab965e26d79fd8e8288fd04a6933193db20f13cef2224a' 
  AND token = 'bZL13n/DiKwb3AnjFUb1+BKjP6p+XwNsJyhXOpCc3xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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