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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0220760cc712c95ad3bacdf511d2cf17e61a094eb131e0a6492528dbf1fb1227' 
  AND token = 'BT4QiKcfsXA1kbm40TUOa9FxXdrwbs0YpE2+FpL33Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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