SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e2dd0f84f84fa1bf3417237f8b5218b4a8458b23663e129c6309c1f9b713451' 
  AND token = '2hqGpScB06Sf3k2V0gDYS6XnxIZNKSIAJeA/zY1HTv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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