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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc84c7051d06e130558eee268b4abc3507b9face8ed5e05572e052d9530de075' 
  AND token = 'zUawRfPTIZIFszthAN1lLxh2rje1L2DaWX8OhcHTR+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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