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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d89a5af096cf5046a50ac9e8d34d40214ffd0a4c826dadabbefdfb02a8c497e' 
  AND token = '/nlSc2NFDdBzvhGI2THvHbIu5cY+aVBMecCGeRkzj3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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