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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f090f5d8c20cff7a7c046bd2b81f1e2f95578faa79a6bac49ec42a229b41a9d' 
  AND token = 'ONSd4dmYy9A76ObSCWLURJJCAWoH8KK18iPS/MCaXuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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