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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569a07793033600ea776ebc0bfcf0a3bcbea0f7a138e267cdd9728f3f9b4bdab' 
  AND token = 'F6F7j9zvTSlVzazNJ+W0y27/a9E9fKEg4lquYxlNKrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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