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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18b7cdf7966158acb62a46def9189b23eb426c88ded1b6952468d09f4d1d42d' 
  AND token = 'B8X6pRl9eZIn0ohMB9819AEghoaKwetBzsrwXRs3s+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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