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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0c496b770f39c42be57af31a4c8876b17c129e8b056668cb87cfd6c7f68599' 
  AND token = '2gJK2oIPNOI+/R9ZQrZzn78WEmNIzPd8zWRYgt4blaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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