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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a50ed5b6df82b59982b5e58d4f8bb32b201397eaf086efc40e0e39c7e8db88' 
  AND token = 'XID4j6tQAp3uG3nQzIx8SJIAxdhrHE2lVPTgDTOpRys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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