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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1e2b2be51e2c5d0afcde8b68327bdbf5c40e095706b258b4d2f895d4860aae' 
  AND token = 'KMU4fv7E9FDCE9AJo+FnlY75XGEM04YPC6/xDEFcMgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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