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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e43e42e1e277bee22c1be1434007f34a13b9ec82f5593f7dd63e12e189178f' 
  AND token = 'hR0S7emEZwdxyFA3Llvg3wsizWaKnF9WmKr07bYQgho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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