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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ad0002d534a4de7eaca55b9acd4ddcbbe8dfac861b140824ad0a739ba032594' 
  AND token = 'xymRD0U61ime8LB5SBvEc3o6H7iCQFKK5e3h97M/lE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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