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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68fa62694ee5e2f7904a5ea25678d74d52635b55a301dee573a4f20496301699' 
  AND token = 'frLuEyLfuGayZ+ag/JzNdrcf1gF6Qcu3QQPKnrx4xLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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