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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd9c1e5325e3e5d845dc1843fa689a039cff2338f19499a43d6d523dac4f64d' 
  AND token = '6BDZKboms02cQTdl9Wju1hfC+dnkVX7l+8MbS4hitPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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