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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305293f9440d7893c5790c77f38f75d83f55f3709a59a5cd8a607be3ce7944a4' 
  AND token = 'h+tjavmWzeMk6Z79slcvB+06tgXX0YhRr7kO5MddxXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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