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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '339e2ac4665dd122070172c55b314fc12d9562bd2fa9eb0369773e702bc8647f' 
  AND token = 'SvpVlEIblGZpm6TAVqB7EqvhyR+pKscbVTX7b7tT+0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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