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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d44e4ad702493d4ddd09cfa0db1bcf985fedd879b6332cafe7818228a809cc4' 
  AND token = 'iI6ep0sDKT5obc6zGs0LgQdBu5CFT4bxXYsNvgrSLpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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