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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308b85f366e9e0a06193cdbfef122f69f7b413fb3c0c0e16077f1cd3034bd536' 
  AND token = '9EwCMcFB/0Lr6k4fuxG1d7amojowvOqKi4+DO3wnOHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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