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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad7ae82c27cfd05ee65b9464a2d6ac953dee2ae374a6fca93028664c067c638' 
  AND token = 'Jo/VwpaDoErygngmRmt2PBq078svmCEBC0A9phSr9+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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