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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ebc4eccfe8e98c7de1d0b63d8b0c8ae66029141016c30aef7db60d83420aeed' 
  AND token = 'YHx7CH5K2IfqsU+Wx8q6Hq23Ed26dYDQs7ZzP6hBiqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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