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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b56adbe0a19fa320d27fd112586ea1ca8149d2619d06a18bdb456a56fc03658' 
  AND token = 'JxZ/lscScZh+zLw3zulnZo1xawK7cDcxZ/cYfstctfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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