SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e372ffb92eddb71790776f05525af8041e3850ce4f9f890efed8195d89744f33' 
  AND token = 'amqthmdMqBy7ghHZ9hJLTHSOdxDGgghrCWbJPybVVYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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