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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '185b1b532b2834fa956904cb21780387271b7721ed67a52432310f027026fd33' 
  AND token = 'SKh1tSQQRf4cNNPztp2ZVlCpQNQkRCXPvuE+IxLYcsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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