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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702e2e00b6ee71199438ff2a000e9a48e5b56e392de9d9ecf5fa9cfc84151cc7' 
  AND token = 'x29Z9mxP+uHLpeAwoO1o8DZqMNn6RWcyKqK+zxmK1s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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