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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0508f26fd411454c3c756c74a2ef140314bd34b20a082bebafbd82bcf3ac9ddf' 
  AND token = 'WsIvALzi/FWK1cTeu3UwJaADnuONDe+pqNb0ayvVIXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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