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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a0246e5d9bd6beef25000ac724c6cc5efedd4854336964930618776a01ca8e' 
  AND token = 'yvPd9nBHpgxqys335V2EE6imNS5Ozkdku78MjqtDC9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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