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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db177c2d71191f543818b363fc76f0dc8c86cb23e15b21ad76f4a246f487b278' 
  AND token = 'wdHj28rgcZXInBRtInx5+5jhK2devlc1Y1HJpUPnc6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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