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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bdbbf1e2faa2ce6a1ade04e78dd9e327fc2e5bad33a99a801b3156e806fa969' 
  AND token = '+2koZhxa346gBeRQ7TEi7Z2ry9CZLrgTZhfejqE/r9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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