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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3e7a29745c35d507559c641d40062b937ae28c63668962032afa8ad2da0446' 
  AND token = 'uMgc2EjE51UDSwxJ6W678fqzkQpqd/tmZawQJafGR/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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