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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bed1fc0de46201f0f6b276ef723f6a89ce6dd4816a9be0636b24e7c6a6dbd5' 
  AND token = '1xg7AOMyoLId/GbDDbxnM/qQB+Dc8NyohNYMYNJ8XpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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