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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d017e08be832081811f58461bf94979ef90aa3e924471c723a66708a9f41805' 
  AND token = 'Gcr/GldJsZSc9x9Wv6x3M1+wK51vFcsFXuRiNGCAJkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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