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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c9606b9ca6cb41cc239721d9ca378a8d8670858bd821b0d6b1b5df3f1dfb32' 
  AND token = 'hcc0HYy71HWyctiOdDlkTZQT+4O+fkiVABSuCbAJ8uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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