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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa0eebef9919f0d52002928ef0addb0d19289deebb3179d7d2c5a2902311a06' 
  AND token = '39CRaSvW3zT+34ii1h0HTAGewQ2cHOpeIYBfcCjmJbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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