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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920faa62be4016b39dcc8fafc213666176d7a6ac1d72b4ba889e63b65f803328' 
  AND token = 'gIjlJCeUapKQN+n7UvoSNVzO7DIFFe3861exc0pRQ74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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