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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97236d6c0d7d9dee9fed8dcda436f982d43781369b91bb9887909910fc83da1' 
  AND token = 'RRabPVGtwrO7G7ssJEdbP1llbTdd7bfMlgMMiGjhTUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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