SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e2ee57488d4a5cfa01b93cacd22455296414d3ccb76b669e4d6e68383507ef' 
  AND token = '9hC3KjZjEIJhmwn5bRcHLnKt+owvs/aLn8/7FrEsYxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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