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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a55edc55e2c999e2b3f79fc51156bc9037120c10b0e232f3e5a3ddfe5ab5c2' 
  AND token = 'kihyTUP7t0MtIv1CGnbifI/6hmanJaJSJg+MiVq1GqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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