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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad1d98bf2494f8091735039dd47f169aaf2a1eee71087dcb258a1181780b5b3c' 
  AND token = 'EF9Sg3tV+XeA5+PY442nzh0jk14JJEJCbe4rSLzknCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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