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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e130352897c340397a0c33e0d37f920c4738ed2e8b822d40d7789087fa497b9' 
  AND token = 'dxGOKkJi2or1O0icD/Bq85BQr5pwElER35/uZuPRiW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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