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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849a2d034f91d5134cd2a8b41dc7e02b55ce77bf1c154119c073d5cc3724d2fc' 
  AND token = 'O30UxVK+a+o5fXqvEX3O+xuZYWo/6T7AY+UJsWkdP24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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