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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544a48b0888a9edf570999418f88443339db8cc87502f92cdd5f0d829678afb8' 
  AND token = 'II2k8tjVfHZ5NONQw7UbiAj1jqDPS3iyg6qGz/pv1ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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