Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87600a25afbde71083b6c7b8e866af33cedf6f54d735407adbb105f2ccbd8cc' 
  AND token = 'xegoz3hqHi7uNV+dqyqH8KlmX0knO4FzUwC+qTk/vxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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