SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd362a65787ef19a8260d94fd474e4568a43d497b718ddb65cd3e9f45cbf36394' 
  AND token = 'HEUMgdFvh4wCJBZu2pe01Vc+m5XgWJnMq95qTrpR5fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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