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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aed3c36a3c495565a14c0b65d6648d436436e6a8e6d736b1d89ced373817699' 
  AND token = '4t72TZIao7H5FCtinxfTi0k831LvirpmPJDEoWxVFLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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