SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b9e1e454f753b98222d4636b7f8dff485223750fd77c1f6a2aa13375dfcc72' 
  AND token = 'G5nWBBp5Z0AV5K+MQCta79QzzH2xB8wdrgpjE9CRF0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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