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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abde8cc07e3553613179e74d9dce7cc529d97f36486efb13af079b656d38655' 
  AND token = 'je+OgHM/+h7g5L0yReNDOM+zhHz7TfuFLQCB/SNSFbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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